Question

v^2=u^2+2as
u=3
a=9.8
s=12

Work out the value of v. Give your answer correct to 1d.p.

Answer 1

@hazem-wardat @bibby

Answer 2

1 DP means we're rounding to the tenths place. Just repeat what we did last question.

solve for u^2 + 2as and take the square root of both sides

Answer 3

so is this 9+2*9.8*12

Answer 4

or 9+2*9.8+12

Answer 5

\[\large 9+ 2*a*s = 9 + (2*9.8*12)\]

Answer 6

244.2?

Answer 7

it'll be clearer to you if you line up the equations and then fill in the variables.
\[\huge u^2+2as\]\[\huge 3^2+[2*12*9.8]\]

Answer 8

yep!

Answer 9

then do i square root 244.2

Answer 10

you do. because you have
\[\huge v^2 =244.2 \]but you want v alone

Answer 11

brb

Answer 12

sorry i took so long the doctor had to check my temp again

Answer 13

@bibby

Answer 14

lol are you in a doctor's office? no worries

Answer 15

No I have stayed in the hospital for a week now they say they will send me out next week

Answer 16

When i am well hopefully

Answer 17

oh :<, feel better.

Anyhow we take the square root of both sides
v^2 = 244.2

Answer 18

15.626899884494 is square root of 244.2

Answer 19

15.6 to be short

Answer 20

Exactly. Re-read the directions. We want it to one decimal place.

Answer 21

yep good job

Answer 22

thnx again

Answer 23

but what is:


s=ut=0.5at^2

a=9.8
t=5
u=7

Answer 24

ask it in another question

Answer 25

okay